00001373h, 00000000_00000000h, 00001374h – AMD Geode LX [email protected] User Manual
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AMD Geode™ LX Processors Data Book
CPU Core Register Descriptions
33234H
5.5.2.45 Floating Point Environment Data Pointer (FPENV_DP_MSR)
FPENV_DP_MSR provides access to the floating point (FP) environment data pointer. Software better accesses the float-
ing point environment data using the FLDENV/FSTENV and FSAVE/FRSTOR instructions.
5.5.2.46 Floating Point Environment Opcode Pointer (FPENV_OP_MSR)
FPENV_OP_MSR provides access to the floating point (FP) environment opcode. Software better accesses the floating
point environment opcode using the FLDENV/FSTENV and FRSTOR/FSAVE instructions.
MSR Address
00001373h
Type
R/W
Reset Value
00000000_00000000h
FPENV_DP_MSR Register Map
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
RSVD
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
DP
FPENV_DP_MSR Bit Descriptions
Bit
Name
Description
63:32
RSVD
Reserved.
31:0
DP
Data Pointer. Effective address of memory operand of last FP instruction that may have
caused an FP error.
MSR Address
00001374h
Type
R/W
Reset Value
00000000_00000000h
FPENV_OP_MSR Register Map
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
RSVD
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
RSVD
OP
FPENV_OP_MSR Bit Descriptions
Bit
Name
Description
63:11
RSVD
Reserved.
10:0
OP
Opcode Pointer. Opcode of last FP instruction executed that may have caused an FP
error.